Gjallarhorn

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Heimdallr blows into Gjallarhorn in this illustration from an 18th century Icelandic manuscript.
Heimdallr blows into Gjallarhorn in this illustration from an 18th century Icelandic manuscript.

In Norse mythology, the Giallarhorn or Gjallarhorn ("ringing horn") is the horn with which the gatekeeper god, Heimdallr, announces Ragnarök. The name of the horn is related to the word gala (English cognate "yell") which means "to shout" or "to sing out."

In Gylfaginning, Gjallarhorn is also the name of a drinking horn used by the god Mímir when he imbibes from the Mímisbrunn, the well of knowledge and wisdom.